Knob assembly with a display device and appliance having the same

ABSTRACT

A knob assembly includes a knob located at a front panel of the knob assembly and configured to rotate about an axis, a knob ring that is located at the front panel, that surrounds the knob, and that rotates about the axis independently of rotation of the knob, an adjusting shaft that extends from the knob through the knob ring in a direction rearward of the front panel and that rotates based on rotation of the knob and causes operation of a device, a first rotation sensing part that senses rotation of the adjusting shaft, and a first sensing target that rotates based on rotation of the adjusting shaft. A position of the first sensing target changes based on rotation of the first sensing target, and the first rotation sensing part senses at least one of the position or a change of the position of the first sensing target.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to and the benefit of Korean PatentApplication No. 10-2017-0094805, filed on Jul. 26, 2017, the disclosureof which is incorporated herein by reference in its entirety.

FIELD

The present disclosure relates to a knob assembly and an appliancehaving the same, and more particularly, to a knob assembly used formanipulating an appliance and an appliance having the same.

BACKGROUND

Cooking appliances may be used to cook food, and may be installed in akitchen space to cook food according to a user's intention. The cookingappliances may be classified in various ways according to, for example,heat sources used therein, forms thereof, and types of fuel.

In classification according to the forms in which food is cooked,cooking appliances may be classified as an open type and a closed typeaccording to the form of space in which food is placed. The closed typecooking appliances may include an oven, a microwave, etc., and the opencooking appliances may include a cooktop, a hob, etc.

The closed type cooking appliances may include a space that isconfigured to receive food and that is sealed, and the sealed space maybe heated to cook food. The open type cooking appliances may include anopen space in which food or a container filled with food may be placed,and the food or the food container may be heated to cook food.

The closed type cooking appliances may include a cooking compartment,which is a space being sealed when food placed therein is attempted tobe cooked. The cooking compartment may be a space in which food issubstantially cooked. A heat source is provided inside or outside thecooking compartment to heat the cooking compartment.

In some examples, complex cooking appliances may include a closed typecooking appliance, an open type cooking appliance, and a plurality ofheat sources. For example, the complex cooking appliances may cookvarious types of food, and a plurality items of food simultaneously.

In some examples of the complex cooking appliance, an open type cookingappliance may be disposed above a closed type cooking appliance. Aplurality of heaters or burners may be installed in the open typecooking appliance to allow a plurality of dishes to be cookedsimultaneously.

For example, a user may use a closed type cooking appliance forbarbecuing, baking, or roasting meat or fish, and may use an open typecooking appliance exposed at the top to cook, for example, by heating acontainer filled with food.

In some examples, a manipulation part may be provided at a front surfaceof a cooking appliance. For example, a manipulation part is provided ata portion corresponding to an upper front surface of a cookingappliance, and a plurality of knobs for adjusting heating power may beinstalled at the manipulation part.

In some examples, a knob may include a knob that allows a rotatingmanipulation by a user, and a knob ring that surrounds the knob. Forinstance, the knob may receive a rotating manipulation for adjusting anopening amount of a valve, and the knob ring, which surrounds the knob,may improve an appearance of the knob.

In some examples of a cooking appliance including an oven or a complexcooking appliance, a timer for controlling an operation time of thecooking appliance may be further included in addition to a knob foradjusting heating power.

For example, a timer may be installed in a manipulation part along witha knob, and may include a separate manipulation switch which isindependent from the knob.

In some examples of a complex cooking appliance in which a plurality ofheat sources are provided, a manipulation part may include numerousknobs. In some cases, when manipulation switches such as a timer areadded thereto, the number of components disposed in the manipulationpart may increase. In some cases, a user may need to select a knob or amanipulation switch that is suitable for a certain purpose, and mayprefer a simple exterior of an appliance.

SUMMARY

One aspect of the present disclosure is to provide a knob assemblyincluding a structure that can improve an appearance of a front surfaceof an appliance as well as convenience in use, and an appliance havingthe same.

Another aspect of the present disclosure is to provide a knob assemblythat can decrease the number of components, assembling processes, andmanufacturing costs and that can provide improved performance of sensingmanipulations of manipulation switches such as a knob and a knob ring,and an appliance having the same.

According to one aspect of the subject matter described in thisapplication, a knob assembly includes a knob located at a front panel ofthe knob assembly and configured to rotate about an axis, a knob ringthat is located at the front panel, that surrounds the knob, and that isconfigured to rotate about the axis independently of rotation of theknob, an adjusting shaft that extends from the knob through the knobring in a direction rearward of the front panel, the adjusting shaftbeing configured to rotate based on rotation of the knob and beingconfigured to cause operation of a device, a first rotation sensing partconfigured to sense rotation of the adjusting shaft, and a first sensingtarget that is configured to rotate based on rotation of the adjustingshaft. A position of the first sensing target changes based on rotationof the first sensing target, and the first rotation sensing part isfurther configured to sense at least one of the position of the firstsensing target or a change of the position of the first sensing target.

Implementations according to this aspect may include one or more of thefollowing features. For example, the first rotation sensing part may befurther configured to sense the position or the change of the positionof the first sensing target without contacting the first sensing target.The first sensing target may include a magnetic member configured togenerate magnetic force, and the first rotation sensing part may includea Hall sensor configured to sense magnetic force within a distance fromthe Hall sensor. The first rotation sensing part may include a pluralityof Hall sensors that are each configured to generate a signal based ondetection of magnetic force and that are arranged at an interval along arotation path of the first sensing target. The plurality of Hall sensorsmay include a first Hall sensor located at a first position at the firstrotation sensing part, and a second Hall sensor located at a secondposition that is different from the first position. The first Hallsensor is configured to generate a first type of signal, and the secondHall sensor is configured to generate a second type of signal that isdifferent from the first type of signal.

In some implementations, the knob assembly may further include a secondrotation sensing part configured to sense rotation of the knob ring. Theknob assembly may further include a second sensing target that isconfigured to rotate based on rotation of the knob ring. A position ofthe second sensing target may change based on rotation of the secondsensing target, and the second rotation sensing part may be configuredto sense at least one of the position or a change of the position of thesecond sensing target. The second rotation sensing part may beconfigured to sense the position or the change of the position of thesecond sensing target without contacting the second sensing target.

In some examples, the second sensing target may include a magneticmember configured to generate magnetic force, and the second rotationsensing part may include a Hall sensor configured to sense magneticforce generated by the magnetic member. The second rotation sensing partmay include a plurality of Hall sensors that are each configured togenerate a signal based on detection of magnetic force, and that arearranged at an interval along a rotation path of the second sensingtarget.

In some implementations, the knob assembly may further include a displaydevice that is located at the knob ring. The display device may beconfigured to output a first result value corresponding to a rotation ofthe knob sensed by the first rotation sensing part. The knob assemblymay further include a second rotation sensing part configured to senserotation of the knob ring, and the display device may be configured tooutput at least one of the first result value corresponding to therotation of the knob or a second result value corresponding to arotation of the knob ring sensed by the second rotation sensing part.The display device may be configured to alternate output of the firstresult value and output of the second result value.

According to another aspect of the subject matter, an appliance mayinclude a front panel, and a knob assembly located at the front panel.The knob assembly includes a knob located at a front panel of the knobassembly and configured to rotate about an axis, a knob ring that islocated at the front panel, that surrounds the knob, and configured torotate about the axis independently of rotation of the knob, anadjusting shaft that extends from the knob rearward of the front panelthrough the knob ring, the adjusting shaft being configured to rotatebased on rotation of the knob and being configured to cause operation ofa device coupled to the appliance, a first rotation sensing partconfigured to sense rotation of the adjusting shaft, and a first sensingtarget configured to rotate based on rotation of the adjusting shaft. Aposition of the sensing target changes based on rotation of the firstsensing target, and the first rotation sensing part is furtherconfigured to sense at least one of the position of the first sensingtarget or a change of the position of the first sensing target.

Implementations according to this aspect may include one or more of thefollowing features as well as one or more of the foregoing featuresdescribed above in regard to the knob assembly. For example, the firstrotation sensing part may be further configured to sense the position orthe change of the position of the first sensing target withoutcontacting the first sensing target. The first sensing target mayinclude a magnetic member configured to generate magnetic force, and thefirst rotation sensing part may include a Hall sensor configured tosense magnetic force within a distance from the Hall sensor.

In some implementations, the knob assembly may further include a secondrotation sensing part configured to sense rotation of the knob ring, anda second sensing target configured to rotate based on rotation of theknob ring. A position of the second sensing target changes based onrotation of the second sensing target, and the second rotation sensingpart is configured to sense at least one of the position of the secondsensing target or a change of the position of the second sensing target.The second rotation sensing part may be configured to sense the positionor the change of the position of the second sensing target withoutcontacting the second sensing target. In some examples, the knobassembly may further include a display device that is located at theknob ring and that is configured to output a result value correspondingto at least one of a rotation of the knob or a rotation of the knobring.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a view illustrating an example appliance having an exampletimer.

FIG. 2 is a front view illustrating a front surface of an example knobassembly.

FIG. 3 is a side view illustrating an example coupling state of the knobassembly.

FIG. 4 is an exploded perspective view illustrating the knob assembly.

FIG. 5 is a cross-sectional view illustrating a cross-section of thecoupling state of the knob assembly.

FIG. 6 is an exploded perspective view illustrating an example knobring.

FIG. 7 is a rear perspective view illustrating rear surfaces of examplecomponents of the knob ring illustrated in FIG. 6.

FIG. 8 is a rear view illustrating an example assembly structure of theknob assembly.

FIG. 9 is a view illustrating an example manipulation state in which theknob ring of the knob assembly illustrated in FIG. 8 is rotatedcounterclockwise.

FIG. 10 is a view illustrating an example manipulation state in whichthe knob ring of the knob assembly illustrated in FIG. 8 is rotatedclockwise.

FIG. 11 is a perspective view illustrating a portion of an example knobassembly.

FIG. 12 is a perspective view illustrating the knob assembly illustratedin FIG. 11 in a different direction.

FIG. 13 is a schematic view illustrating an example configuration of anexample first sensing object and an example first rotation sensing part.

FIG. 14 is a view illustrating an example state in which a position ofthe first sensing object illustrated in FIG. 13 is changed.

FIG. 15 is a schematic view illustrating a configuration of an examplesecond sensing object and an example second rotation sensing part.

FIG. 16 is a view illustrating an example state in which a position ofthe second sensing object illustrated in FIG. 15 is changed.

DETAILED DESCRIPTION

Hereinafter, implementations of a knob assembly and an appliance havingthe same will be described with reference to the accompanying drawings.For convenience of description, thickness of lines or sizes of elementsillustrated in the drawings may be exaggerated for clarity ofdescription and convenience. The terms which will be described below areterms defined in consideration of functions in the present disclosure,and may vary according to an intention or practice of a user oroperator. Thus, such terms will be defined on the basis of contentthroughout the present specification.

[Structure of Appliance Having Timer Function]

FIG. 1 illustrates an example appliance having a timer function.

Referring to FIG. 1, an appliance 10 such as a cooking applianceincluding but not limited to an oven may include a knob 11 located at afront surface for manipulating operation of the appliance, a knob 12 foradjusting time of a timer, a display device 15 for displaying a state ofthe appliance, and a switch 16 for separate manipulation.

An appliance such as a cooking appliance having an oven often mayoperate for a long operation time. In some examples, a timer for settingan operation time may be installed in the appliance.

The knob 11 for adjusting heating power, a rotational speed, a strengthof operation, and the like and the knob 12 for adjusting time of a timermay be provided as separate switches having different shapes or operatedby different methods. In some examples, for unity of design andconvenience of manipulation, the knobs 11 and 12 may be provided as aplurality of rotary switches having the same type.

In some examples, the display device 15 may display a manipulation stateor the like of an appliance. For example, a cooking appliance maydisplay, on the display device 15, information including but not limitedto an output (e.g., temperature) of a burner, time of a timer, a cookingmode of an automatic cooking function, or the like.

In some examples, as the number of heating elements having a timerfunction increases, the number of timer handles may also increase as aconsequence. In some cases, the shape of the front surface of theappliance may become complicated, and an appearance of the front surfacemay be degraded.

In some examples, the knob 11 for manipulating operation of theappliance and the knob 12 for adjusting time of a timer are provided asswitches of the same type. In some cases, a user may find it difficultto intuitively recognize which function is performed by which knob inthe design, and a convenience level in use is may be decreased.

The present disclosure provides a knob assembly with an improvedstructure to improve an appearance of a front surface of an appliance aswell as to provide improved convenience in use, and appliance having thesame.

Hereinafter, each element of the knob assembly according to oneimplementation of the present disclosure will be described. Here, thecase in which the appliance is a cooking appliance will be described asan example. However, the appliance of the present disclosure is notlimited thereto, and in addition to the cooking appliance, may includeany appliance in the form in which both a knob for manipulatingoperation of an appliance such as a heater for heating and a dish washerand a timer for adjusting an operation time of the appliance aredisposed.

[Structure of Knob]

FIG. 2 is a front view illustrating a front surface of an example knobassembly according to one implementation of the present disclosure, andFIG. 3 is a side view illustrating an example coupling state of the knobassembly. FIG. 4 is an exploded perspective view illustrating anexploded state of the knob assembly, and FIG. 5 is a cross-sectionalview illustrating a cross-section of the coupling state of the knobassembly.

Referring to FIGS. 2 to 5, a knob 110 is connected to a valve shaft 194a of a valve assembly 190 configured to adjust heating power.

In some implementations, the knob 110 may be a no-return type rotaryswitch, for instance. The knob 110 may maintain a position withoutchange after a user rotates the knob 110, and an output of acorresponding heating element may be recognized according to an angle atwhich the knob 110 is rotated.

For example, in the case of a gas burner, a valve assembly 190 is avalve configured to adjust a gas supply amount, and in the case of anelectric stove or an induction stove, the valve assembly 190 is anoutput adjusting devices (e.g., a variable resistor) configured toadjust an output.

As described above, the knob 110 is connected to the valve shaft 194 aof the valve assembly 190. In some examples, a knob assembly structureof a cooking appliance may include the knob 110 that is directly coupledto a valve shaft. In some examples where the knob 110 is directlycoupled to the valve shaft 194 a, a misalignment due to tolerance or thelike of the valve shaft 194 a may be directly transferred to the knob110, and accordingly, a problem in which the knob 110 and a knob ring120 are misaligned occurs.

In some implementations, the knob assembly may include a structure inwhich a knob shaft 194 b is coupled to the knob 110 instead of the knob110 being directly coupled to the valve shaft 194 a, and a universaljoint 170 may connect the knob shaft 194 b to the valve shaft 194 a.

The universal joint 170 may absorb a position error of the valve shaft194 a between the knob shaft 194 b and the valve shaft 194 a, and mayperform an operation of transferring a rotating operation and a pressingoperation of the knob 110 to the valve shaft 194 a.

Hereinafter, a shaft connection body, which is formed by connectionbetween the valve shaft 194 a of the valve assembly 190 and the knobshaft 194 b coupled to the knob 110, will be referred to as an adjustingshaft 194.

In some implementations, the knob 110 may include a protruding handleportion having a circular shape. In the present implementation, althoughthe handle portion protrudes in a bar shape as an example, the handleportion may have various other shapes.

In some implementations, the knob 110 may be manufactured with asynthetic resin injection material or manufactured by processing a metalmaterial. The material and shape of the knob 110 may be changed invarious ways.

[Structure of Knob Ring]

The knob ring 120 is a component disposed at an outer peripheral surfaceof the knob 110 to improve an exterior around the knob 110.

In some implementations, the knob ring 120 may support the knob 110 andmay improve quality of an exterior of the cooking appliance by finishingan exterior of the knob 110.

The knob ring 120 may be disposed to serve as a timer manipulatingswitch and a display configured to display time of a timer and a levelof heating power.

In some implementations, the knob ring 120 may be installed to berotatable independently of rotation of the knob 110, and the time of thetimer may be set by rotating the knob ring 120. A display device 123 isdisposed at the knob ring 120, and the time of the timer and the levelof heating power may be displayed through the display device 123.

For example, a first rotation sensing part 300 configured to sense arotation amount of the knob 110 and a second rotation sensing part 350configured to sense a rotation amount of the knob ring 120 are disposedin the knob assembly of the present implementation. The first rotationsensing part 300 senses a rotation amount of the adjusting shaft 194connected to the knob 110. The second rotation sensing part 350 sensesrotation of an actuating ring 150 connected to the knob ring 120.

The knob 110 and the knob ring 120 may be installed to be exposed to theoutside of a front panel C of a cooking appliance, and heating power,time of a timer, and the like may be displayed on the display device 123disposed at the knob ring 120.

The heating power level displayed on the display device 123 may be avalue calculated on the basis of a value of a sensed rotation amount ofthe knob 110, and the time of the timer displayed on the display device123 may be a value calculated on the basis of a value of a sensedrotation amount of the knob ring 120.

The display device 123 may include a heating power-displaying portionand a timer time-displaying portion that is separate from the heatingpower-displaying portion. In some implementations, a heating power levelor a timer time may be selectively displayed on the display device 123.

For example, the display device 123 may be operated such that only aheating power level is fundamentally displayed when a timer is not set,and a heating power level is displayed for a predetermined amount oftime and then a timer time is displayed for a predetermined amount oftime when the timer is set.

In some examples, a color of light when a heating power level isdisplayed and a color of light when a timer time is displayed may bemade different so that a user may easily recognize which of the heatingpower and the timer time a displayed number is indicating.

For example, the heating power may be displayed with a red color, andthe timer time may be displayed with a white (or blue) color. When boththe heating power level and the timer time are displayed, the heatingpower level may be displayed for 2 seconds and then the timer time maybe displayed for the next 2 seconds, for instance.

As described above, both the heating power level and the timer time maybe displayed through the knob assembly. In this way, informationnecessary for using a cooking appliance may be effectively provided to auser without a separate display being installed at the front panel C.

[Structure of Actuating Ring]

The actuating ring 150 is coupled to a rear surface of the knob ring 120and is disposed to integrally rotate with the knob ring 120. In thiscase, a rotation amount of the actuating ring 150 and a rotation amountof the knob ring 120 are the same, and therefore, manipulation of theknob ring 120 may be sensed by sensing the rotation amount of theactuating ring 150.

In some examples, a knob ring gear part G2 may be disposed at theactuating ring 150.

For example, the actuating ring 150 may include a coupling shaft part151, a flange part 152, and a wing part 153.

The coupling shaft part 151 is a portion that passes through a supportframe 140 and is supported to be rotatable by the support frame 140. Thecoupling shaft part 151 may be formed in the shape of a circular tube,and a space through which the adjusting shaft 194 may pass is formedinside the coupling shaft part 151. The coupling shaft part 151 may becoupled to the knob ring 120 via the front panel C and the support frame140, and in this way, coupling that allows the actuating ring 150 to beintegrally rotated with the knob ring 120 is performed.

The flange part 152 is formed in the shape of a flange protruding from arear end of the coupling shaft part 151 outward in a diametric directionof the coupling shaft part 151. In this example, a direction toward theoutside of the front panel C with respect to the front panel C will bereferred to as the front, and a direction toward the valve assembly 190will be referred to as the rear.

Based on a flat surface coming into contact with the support frame 140behind the support frame 140, the flange part 152 may prevent deviationof the actuating ring 150 toward the front and allow the actuating ring150 to be stably rotated without swinging in front and rear directions.

The wing part 153 is formed to protrude from an outer peripheral surfaceof the coupling shaft part 151 outward in the diametric direction of thecoupling shaft part 151. Unlike the flange part 152 formed in the shapeof a disc that surrounds the coupling shaft part 151, the wing part 153is formed in the shape of a bar extending outward in the diametricdirection of the coupling shaft part 151.

The wing part 153 is inserted into a fixing frame 160. The wing part 153may move within a movement-possible region inside the fixing frame 160,and movement thereof is limited from a point interfering with an upperinner wall or a lower inner wall of the fixing frame 160.

When the movement range of the wing part 153 is limited by the fixingframe 160 as above, an angle of rotation in both directions of theactuating ring 150 may be limited to a predetermined range. The wingpart 153 is also a coupling portion between elastic members S1 and S2which will be described above and the actuating ring 150.

[Structure of Support Frame]

The support frame 140 is coupled to the front panel C and serves tosupport the knob ring 120. The knob 110 and the knob ring 120 arecoupled to aligned positions of the front panel C, and the front panel Cis formed of a metal thin plate. Therefore, when a hole is formed in thefront panel C, and the knob ring 120 is rotated by being directly rubbedagainst the hole, a problem in which the knob ring 120 is cut due to thefront panel C may occur.

In consideration of such an aspect, in the present implementation, astructure in which the support frame 140 is installed behind a hole Hformed in the front panel C, and the knob ring 120 is rotated while theknob ring 120 is supported by the support frame 140 installed as aboveso that generation of friction between the knob ring 120 and the frontpanel C during rotation of the knob ring 120 is suppressed is provided.

According to the present implementation, the support frame 140 includesa frame main body part 141, a through-hole 143, and a support part 145.

The frame main body part 141 forms a frame of the support frame 140 andis coupled to the front frame C to be disposed behind the front panel C.

The through-hole 143 corresponding to an outer diameter of the actuatingring 150 coupled to the knob ring 120 is formed to pass through an innerside of the frame main body part 141. The through-hole 143 forms a pathfor the coupling shaft part 151 of the actuating ring 150 to passthrough the support frame 140 in the front and rear directions.

The support part 145 forming a sidewall configured to support thecoupling shaft part 151 to be rotatable around the through-hole 143 isformed outside the through-hole 143. The actuating ring 150 is seated onthe support part 145 disposed as above, and accordingly, the actuatingring 150 is supported by the support frame 140 to be rotated at apredetermined position.

The knob ring 120 coupled to such an actuating ring 150 is supported tobe rotated about a predetermined axis on the support frame 140 by asupport structure between the support frame 140 and the actuating ring150 formed as above.

In other words, because a position of the knob ring 120 is determined bythe support frame 140, and the support frame 140 is fastened to thefront panel C, the position of the knob ring 120 may be fixed withrespect to the front panel C.

As described above, the support frame 140 surrounds the outer peripheralsurface of the actuating ring 150 and serves to support the actuatingring 150 to be rotatable about the predetermined axis.

The support frame 140 is coupled to a guide rod 210 disposed at a burnerframe 200 to which the valve assembly 190 is fixed.

The guide rod 210 is provided for fixing between the burner frame 200and the support frame 140, and the support frame 140 coupled to theguide rod 210 may be fixed to a predetermined position with respect tothe burner frame 200.

[Structure of Fixing Frame]

The fixing frame 160 is provided to prevent the actuating ring 150 frombeing deviated rearward (toward the inside of the appliance) from thefixing frame 160, is installed at a rear side of the front panel C, andis fastened and fixed to the support frame 140 by a fastening objectsuch as a screw.

The fixing frame 160 also serves to restrict the range of rotation ofthe actuating ring 150. The fixing frame 160 limits rotations of theactuating ring 150 and the knob ring 120 so that the actuating ring 150and the knob ring 120 are rotatable in left and right directions onlywithin a predetermined angle range.

The fixing frame 160 is formed in the shape similar to that of a bowtie. In the fixing frame 160, portions corresponding to wings of a boware portions configured to limit rotation of the actuating ring 150 sothat the actuating ring 150 is rotatable only within a predeterminedangle range, and a portion connecting the both wings is a portionconfigured to prevent deviation of the actuating ring 150 toward therear.

According to the present implementation, the fixing frame 160 mayinclude a fixing part 161 and a wing insertion part 163.

The fixing part 161 is coupled to the support frame 140 and supports theactuating ring 150. The fixing part 161 corresponds to a portionconnecting the both wings in the fixing frame 160 formed in the shapesimilar to that of a bow tie.

For example, the fixing part 161 is disposed at a rear side of theflange part 152 of the actuating ring 150 and is coupled to the framemain body part 141, while the flange part 152 is disposed therebetween,to support the actuating ring 150 in a direction in which the flangepart 152 and the wing part 153 is adhered to the frame main body part141.

In this way, a position of the actuating ring 150 in the front and reardirections is restricted in the form in which a front side of the flangepart 152 is supported by the support frame 140, and a rear side of theflange part 152 is supported by the fixing frame 160. The actuating ring150 may be rotated at a predetermined position while the positionthereof in the front and rear directions is restricted as above, and inthis way, the actuating ring 150 may stably fix a rotary position of theknob ring 120.

The wing insertion part 163 is disposed at each of both sides in a sidedirection of the fixing part 161. The wing insertion parts 163correspond to portions corresponding to the wings of the bow in thefixing frame 160 formed in the shape similar to that of a bow tie.

In each of the wing insertion part 163, the wing part 153 of theactuating ring 150 is inserted to be rotated within a predeterminedangle range. That is, the wing part 153 inserted into the wing insertionpart 163 may move within a movement-possible region inside the winginsertion part 163, and movement thereof is limited from a pointinterfering with an upper inner wall or a lower inner wall of the winginsertion part 163.

When the movement range of the wing part 153 is limited by the winginsertion part 163 as above, an angle of rotation in both directions ofthe actuating ring 150 may be limited to a predetermined range.

[Structure of Bearing Shell]

A bearing shell 130 is a configuration that serves as a bearing thatfacilitates manipulation of the knob ring 120.

The bearing shell 130 may include a cylindrical part 134 formed in acylindrical shape and a disc part 132 bent from the cylindrical part 134and protruding in a radial direction.

The cylindrical part 134 is inserted between the outer peripheralsurface of the actuating ring 150 coupled to the knob ring 120 and aninner peripheral surface of the fixing frame 160. The cylindrical part134 serves to reduce friction between the actuating ring 150 and thefixing frame 160.

The disc part 132 is inserted between the front panel C and the knobring 120. The disc part 132 serves to reduce friction between the knobring 120 and the front panel C. The disc part 132 may also cause theknob ring 120 to be spaced apart from the front panel C at apredetermined interval to suppress the front panel C from beingscratched due to the knob ring 120 coming into contact with the frontpanel C during manipulation of the knob ring 120.

[Structure of Elastic Member]

According to the present implementation, the knob ring 120 is providedin the form in which a return-type manipulation is possible. Forexample, the knob ring 120 is provided in the form in which the knobring 120 is manipulated to be rotatable within a predetermined anglerange clockwise or counterclockwise and then is returned to its originalposition when an external force is released.

The elastic members S1 and S2 provide a restoration force for returningthe knob ring 120 to an initial position. Such elastic members S1 and S2may include a first elastic member S1 configured to provide arestoration force clockwise and a second elastic member S2 configured toprovide a restoration force counterclockwise.

In some implementations, each of the elastic members S1 and S2 is in theform of a coil spring having one longitudinal side fixed to theactuating ring 150 and the other longitudinal side fixed to the supportframe 140.

According to this, wing-side coupling parts 155 to which the onelongitudinal sides of the elastic members S1 and S2 are coupled areprovided at respective wing parts 153 of the actuating ring 150, andframe-side coupling parts 147 and 148 to which the other longitudinalsides of the elastic members S1 and S2 are coupled are provided atrespective frame main body parts 141 of the support frame 140.

In some implementations, the wing-side coupling parts 155 and theframe-side coupling parts 147 and 148 are provided in shapes ofprotrusions protruding from the respective wing parts 153 or frame mainbody parts 141. The elastic members S1 and S2 may be fixed by hookportions respectively provided at the both longitudinal sides of theelastic members S1 and S2 being hooked to the wing-side coupling parts155 and the frame-side coupling parts 147 and 148.

Further, the frame-side coupling parts 147 and 148 may include a firstframe-side coupling part 147 disposed above the wing-side coupling parts155 and having the first elastic member S1 coupled thereto, and a secondframe-side coupling part 148 disposed below the wing-side coupling parts155 and having the second elastic member S2 coupled thereto.

That is, the first elastic member S1 is installed in the form in whichone longitudinal side thereof is coupled to the wing-side coupling part155 and the other longitudinal side thereof is coupled to the firstframe-side coupling part 147. The second elastic member S2 is installedin the form in which one longitudinal side thereof is coupled to theother wing-side coupling part 155 and the other longitudinal sidethereof is coupled to the second frame-side coupling part 148.

When an external force is not applied, elastic forces of the firstelastic member S1 and the second elastic member S2 installed as aboveare balanced, and accordingly, the knob ring 120 is maintained at aninitial position.

Because the actuating ring 150 and the knob ring 120 are integrallyrotated, the knob ring 120 is maintained at an initial position due tothe elastic forces of the elastic members S1 and S2 connected to theactuating ring 150. The knob ring 120 maintained at the initial positionas above may be rotated at a predetermined angle clockwise orcounterclockwise, and when an external force is released while the knobring 120 is rotated, the knob ring 120 may be returned to its originalposition due to restoration forces provided by the elastic members S1and S2.

For example, when the knob ring 120 is manipulated counterclockwise, thefirst elastic member S1 elongated due to rotation of the knob ring 120may provide a restoration force for returning the knob ring 120 to itsoriginal position. i.e., the initial position, and when the knob ring120 is manipulated clockwise, the second elastic member S2 elongated dueto rotation of the knob ring 120 may provide a restoration force forreturning the knob ring 120 to the initial position.

[Detailed Structure of Knob Ring]

FIG. 6 is an exploded perspective view illustrating an exploded state ofan example knob ring, and FIG. 7 is a rear perspective view illustratingrear surfaces of some components of the knob ring illustrated in FIG. 6.

Referring to FIGS. 6 and 7, a knob ring 120 may include a knob ring mainbody 124, a rear plate 125, and a support tube 126.

The knob ring main body 124 forms an exterior of the knob ring 120. Insome examples, the knob ring main body 124 is formed in a shapeincluding a ring shape.

The rear plate 125 is formed in a shape including a disc shape and iscoupled to a rear surface of the knob ring main body 124. The rear plate125 includes a support plate 125 b that enters the front panel C (seeFIG. 3) and protrudes toward an inner portion of the cooking appliance.Further, a support hole 125 c configured to form a path for theadjusting shaft 194 (see FIG. 3) to pass through the knob ring 120, andsupport the adjusting shaft 194 is disposed in the support plate 125 b.

The support tube 126 provided to support the adjusting shaft 194 iscoupled to the rear plate 125. The support tube 126 may include a flange126 a coupled to the rear plate 125, a tapered tube 126 b extending fromthe flange 126 a, and a support rib 126 d extending more than thetapered tube 126 b.

The tapered tube 126 b has a tapered shape in which a diameter narrowsaway from the flange 126 a, and includes a support part 126 c disposedat an end thereof and configured to support the adjusting shaft 194.

In the knob ring 120 including the above-described configurations, atwo-point support structure in which the adjusting shaft 194 issupported at the support hole 125 c and the support part 126 c isprovided.

In the present implementation, because the adjusting shaft 194 isinstalled to be movable by a universal joint instead of being restrictedto a predetermined position as in the related art, a structure capableof stably supporting the adjusting shaft 194 is necessary.

For this, in the present implementation, the two-point support structurein which the adjusting shaft 194 is supported at the support hole 125 cand the support part 126 c is provided by the knob ring 120 such thatthe adjusting shaft 194 may be stably supported.

In addition to the support structure configured to support the adjustingshaft 194 at two or more points, the knob ring 120 may also provide asupport structure capable of supporting a front end of a gear part G1(see FIG. 4) coupled to the adjusting shaft 194.

In the present implementation, a display device 123 capable ofdisplaying a heating power level or a timer time is disposed at the knobring 120. The display device 123 is coupled to the knob ring main body124 via a display housing 122, and a finishing cap 121 is coupled to anouter portion of the display device 123. The finishing cap 121 may bemade of a transparent or translucent material to allow information(e.g., a number) displayed on the display device 123 to be viewed fromthe outside.

FIG. 8 is a rear view showing an assembly structure of the knob assemblyaccording to one implementation of the present disclosure, FIG. 9 is aview illustrating a manipulation state in which a knob ring of the knobassembly illustrated in FIG. 8 is rotated counterclockwise, and FIG. 10is a view illustrating a manipulation state in which the knob ring ofthe knob assembly illustrated in FIG. 8 is rotated clockwise.

For convenience of illustration, the front panel is omitted in FIGS. 8to 10.

Referring to FIGS. 3 and 8, the knob 110 and the knob ring 120 arecoupled to the front side of the front panel, and the support frame 140,the actuating ring 150, and the fixing frame 160 are coupled to the rearside of the front panel.

The fixing frame 160 is fastened to the rear surface of the front panelC, and the actuating ring 150 is fastened to the knob ring 120 via thefront panel. In this case, the center of rotation of the actuating ring150 coincides with the center of rotation of the knob 110. The actuatingring 150 serves to restrict the center of rotation of the knob 110 to beat a regular position with respect to the front panel C. That is, whenthe actuating ring 150 is fixed at a regular position with respect tothe front panel, by this, the knob 110 may be fixed at an accurateposition with respect to the front panel C.

The actuating ring 150 is inserted into the support frame 140, and aportion thereof passes through the front panel and protrudes from thefront surface of the front panel. A front end of the actuating ring 150is formed in a cylindrical shape, and the cylindrical portion protrudesfrom the front surface of the front panel C.

The knob ring 120 is coupled to the cylindrical portion of the actuatingring 150 protruding from the front surface of the front panel C. By theknob ring 120 being coupled to the actuating ring 150 supported by thesupport frame 140, a support structure in which the knob ring 120 issupported by the support frame 140 is formed as a result.

Manipulation of the knob ring 120 may be recognized by rotation of theactuating ring 150, which is rotated by being interlocked with rotationof the knob ring 120. Since the knob ring 120 is a portion exposed tothe outside of the front panel C, it is not desirable in terms ofappearance for the second rotation sensing part 350, which is configuredto sense manipulation of the knob ring 120, to be installed around theknob ring 120 outside the front panel.

In consideration of such an aspect, in the present implementation, thesecond rotation sensing part 350 is installed around the actuating ring150, which is the inside of the front panel, and the second rotationsensing part 350 installed as above may sense rotation of the knob ring120 by sensing rotation of the actuating ring 150 inside the frontpanel.

In a knob assembly structure of the present implementation, a fixingframe 160 configured to prevent the actuating ring 150 from beingdeviated to a rear surface and allow the actuating ring 150 to be stablyoperated is included.

The fixing frame 160 is disposed to cross the rear surface of theactuating ring 150 and be fixed to the support frame 140. The fixingframe 160 serves to prevent the actuating ring 150 from being deviatedto the rear surface and limit a rotation range of the actuating ring 150within a designated range.

According to the present implementation, the actuating ring 150 includesa wing part 153 formed to extend sideward from the center of theactuating ring 150, and the wing part 153 is inserted into the fixingframe 160.

The wing part 153 inserted into the fixing frame 160 as above may movewithin a movement-possible region inside the fixing frame 160, andmovement thereof is limited from a point interfering with an upper innerwall or a lower inner wall of the fixing frame 160.

When the movement range of the wing part 153 is limited by the fixingframe 160 as above, an angle of rotation in both directions of theactuating ring 150 may be limited to a predetermined range.

By applying a structure in which the wing part 153 is disposed at eachof both sides of the actuating ring 150, and movement ranges of the wingparts 153 are limited at the same position, the rotation range of theactuating ring 150 may be more stably limited.

The actuating ring 150 is connected to a pair of elastic members S1 andS2 configured to provide an elastic force for returning the actuatingring 150, which is rotated to a position spaced apart from an initialposition, to the initial position.

Because the actuating ring 150 and the knob ring 120 are integrallyrotated, the knob ring 120 is maintained at an initial position due toelastic forces of the elastic members S1 and S2 connected to theactuating ring 150. The knob ring 120 maintained at the initial positionas above may be rotated at a predetermined angle clockwise orcounterclockwise, and when an external force is released while the knobring 120 is rotated, the knob ring 120 may be returned to the initialposition due to restoration forces provided by the elastic members S1and S2.

For example, when the actuating ring 150 is rotated counterclockwise dueto manipulation of the knob ring 120 as illustrated in FIG. 9, the firstelastic member S1 of the pair of elastic members S1 and S2 provides anelastic force acting clockwise for the actuating ring 150 to be returnedto an initial position. When the actuating ring 150 is rotated clockwisedue to manipulation of the knob ring 120 as illustrated in FIG. 10, thesecond elastic member S2, which is the other one of the pair of elasticmembers S1 and S2, provides an elastic force acting counterclockwise forthe actuating ring 150 to be returned to the initial position.

[Structures of First Sensing Object and First Rotation Sensing Part]

FIG. 11 is a perspective view illustrating a portion of the knobassembly according to one implementation of the present disclosure, andFIG. 12 is a perspective view illustrating the knob assembly illustratedin FIG. 11 in a different direction. FIG. 13 is a view schematicallyillustrating configurations of a first sensing object and a firstrotation sensing part according to one implementation of the presentdisclosure, and FIG. 14 is a view illustrating a state in which aposition of the first sensing object illustrated in FIG. 13 is changed.

Referring to FIGS. 11 and 12, a knob assembly according to the presentimplementation may further include a configuration for sensing arotating manipulation of a knob 110 and a rotating manipulation of aknob ring 120.

According to the present implementation, a first sensing object M1 and afirst rotation sensing part 300 are disposed as configurations forsensing the rotating manipulation of the knob 110, and a second sensingobject M2 (see FIG. 15) and a second rotation sensing part 350 aredisposed as configurations for sensing the rotating manipulation of theknob ring 120. In some implementations, the first sensing object M1 maybe referred to as a first sensing target.

First, configurations of the first sensing object M1 and the firstrotation sensing part 300 will be described with reference to FIGS. 11to 13. The first sensing object M1 is provided such that a positionthereof is changed by interlocking with rotation of the adjusting shaft194, and the first rotation sensing part 300 senses rotation of theadjusting shaft 194 by sensing a change in position of the first sensingobject M1, and from this, senses rotation of the knob 110 connected tothe adjusting shaft 194.

The first sensing object M1 is a configuration that becomes a sensingobject of the first rotation sensing part 300, and is installed on theadjusting shaft 194. In some examples, a rotary plate 250 is installedat the adjusting shaft 194, and the first sensing object M1 is installedat the rotary plate 250.

According to this, the rotary plate 250 is provided in the form of adisc having a center through which the adjusting shaft 194 passes. Therotary plate 250 may be coupled to an outer peripheral surface of theadjusting shaft 194 and be rotated along with the adjusting shaft 194about the adjusting shaft 194 when the adjusting shaft 194 is rotated.

The first sensing object M1 is installed at the rotary plate 250, and isinstalled to be disposed at one side surface of the rotary plate 250facing the first rotation sensing part 300. A position of the firstsensing object M1 installed as above may be changed by the first sensingobject M1 being rotated along with the adjusting shaft 194 about theadjusting shaft 194 when the adjusting shaft 194 is rotated.

In some examples, the first sensing object M1 is disposed at a positionadjacent to an outer peripheral surface of the rotary plate 250. Aposition of the first sensing object M1 disposed at the above positionmay be changed by drawing a trajectory similar to the shape of the outerperipheral surface of the rotary plate 250 when the adjusting shaft 194is rotated.

The first rotation sensing part 300 is provided to sense a change inposition of the first sensing object M1, and is disposed between thefirst sensing object M1 and the valve assembly 190.

In some examples, the first rotation sensing part 300 may include asupporter 310, a case 320, a substrate 330, and a sensor.

The supporter 310 may be coupled to the valve assembly 190. For example,the supporter 310 may be coupled to the case 320 to support the case320. The substrate 330 connected to a controller of an appliance isinstalled at the case 320, and the sensor configured to sense a changein position of the first sensing object M1 is installed at the substrate330.

The first rotation sensing part 300 having the above configurationsenses a position of the first sensing object M1 by a non-contactmethod. For this, the first sensing object M1 may include a magneticmember configured to generate a magnetic force, and the first rotationsensing part 300 may include a Hall sensor 340 configured to sense amagnetic force of a magnetic member within a predetermined distance fromthe first rotation sensing part 300. The Hall sensor 340 is installed atthe substrate 330. When a magnetic member is within a predetermineddistance from the Hall sensor 340, the Hall sensor 340 may sense amagnetic force of the magnetic member and generate a signalcorresponding to the sensed magnetic force.

According to the present implementation, the first rotation sensing part300 includes a plurality of Hall sensors 340, and the plurality of Hallsensors 340 are arranged to be spaced apart at predetermined intervalsalong a rotation path of the first sensing object M1.

That is, when the first sensing object M1 is rotated by drawing acircular trajectory similar to the shape of the outer peripheral surfaceof the rotary plate 250 when the adjusting shaft 194 is rotated, theplurality of Hall sensors 340 are disposed to form a circular shapecorresponding to a rotation trajectory of the first sensing object M1 inthe first rotation sensing part 300.

In the case of a cooking appliance, when a knob 110 is rotated to adjustan opening amount of a valve, an adjusting shaft 194 may be rotated byinterlocking with rotation of the knob 110, and an operation foradjusting the opening amount of the valve may be performed by therotation of the adjusting shaft 194 performed as above.

For example, when the knob 110 is rotated from an initial position by apredetermined angle, gas may start to be supplied through a valve, andwhen the knob 110 is further rotated from the predetermined angle, theamount of gas supplied through the valve may increase or decrease.

In some examples of appliances other than a cooking appliance, such as awashing machine, a dryer, a dishwasher, or the like, a knob 110 may bemanipulated to adjust a speed or strength of operation performed by theappliance or select a type of operation.

The case in which the adjusting shaft 194 is rotated by the knob 110,and the opening amount of the valve is physically adjusted by rotationof the adjusting shaft 194 will be described below as an example.

According this, the adjusting shaft 194 rotated by the knob 110 rotatesa component provided for adjusting an opening amount of a valve insidethe valve assembly 190 to adjust the opening amount of the valve.

The rotary plate 250 is rotated along with the adjusting shaft 194rotated as above, and a position of the first sensing object M1 ischanged by interlocking with such rotation of the rotary plate 250.

That is, the position of the first sensing object M1 may be changed asmuch as a change in the opening amount of the valve, and such change inposition of the first sensing object M1 is sensed by the first rotationsensing part 300.

For example, when a total of twelve Hall sensors 340 are arranged atequal intervals in the first rotation sensing part 300, when the knob110 is rotated 30° from an initial position, the position of the firstsensing object M1, which was disposed closest to any one of the twelveHall sensors 340 (hereinafter referred to as “zeroth Hall sensor”) whenat an initial position, is changed such that, as illustrated in FIG. 14,the first sensing object M1 is located close to another Hall sensor(hereinafter referred to as “first Hall Sensor”) next to the zeroth Hallsensor 340. Accordingly, the first sensing object M1 is sensed by thefirst Hall sensor 340, the first Hall sensor 340 is turned on, and asignal corresponding thereto is generated by the first Hall sensor 340.

For example, when the knob 110 is rotated 30° from the above state, aposition of the first sensing object M1 is changed such that the firstsensing object M1 is disposed close to another Hall sensor (hereinafterreferred to as “second Hall sensor”) next to the first Hall sensor 340.Accordingly, the first sensing object M1 is sensed by the second Hallsensor 340, the second Hall sensor 340 is turned on, and a signalcorresponding thereto is generated by the second Hall sensor 340.

In some examples, the first rotation sensing part 300 includes theplurality of Hall sensors 340, and the Hall sensors disposed atdifferent positions generate different types of signals. That is, all ofa signal generated by the zeroth Hall sensor 340, a signal generated bythe first Hall sensor 340, and a signal generated by the second Hallsensor 340 may be different from each other.

The signals generated by the Hall sensors 340 as above may provideinformation, which is output through the display device 123 (see FIG.2), such as a level of heating power, a speed or strength of operation,a type of operation, and the like. Based on the information displayed onthe display device 123, a user may recognize a state of the knob and astate of the appliance.

For example, from a signal generated by the first Hall sensor 340, itmay be recognized that the knob 110 is manipulated to provide a firstlevel of heating power, which is the weakest heating power, and theinformation recognized as above may be output in the form of text,drawing, or color on the display device 123.

[Structures of Second Sensing Object and Second Rotation Sensing Part]

FIG. 15 is a view schematically illustrating configurations of a secondsensing object and a second rotation sensing part according to oneimplementation of the present disclosure, and FIG. 16 is a viewillustrating a state in which a position of the second sensing objectillustrated in FIG. 15 is changed.

Referring to FIGS. 11, 12, and 15, a second sensing object M2 isprovided such that a position thereof is changed by interlocking withrotation of the actuating ring 150, and the second rotation sensing part350 senses rotation of the actuating ring 150 by sensing a change inposition of the second sensing object M2, and from this, senses rotationof the knob ring 120 connected to the actuating ring 150.

The second sensing object M2 is a configuration that becomes a sensingobject of the second rotation sensing part 350, and is installed on theactuating ring 150. In some examples, the second sensing object M2 isinstalled at the flange part 152 of the actuating ring 150. In someimplementations, the second sensing object M2 may be referred to as asecond sensing target.

The second sensing object M2 is installed on the flange part 152, and isinstalled to be disposed at one side surface of the flange part 152facing the second rotation sensing part 350. A position of the secondsensing object M2 installed as above may be changed by the secondsensing object M2 being rotated along with the actuating ring 150 whenthe actuating ring 150 is rotated.

In some examples, the second sensing object M2 is disposed at a positionadjacent to an outer peripheral surface of the flange part 152. Aposition of the second sensing object M2 disposed at the above positionmay be changed by drawing a trajectory similar to the shape of the outerperipheral surface of the flange part 152, which has a circular shape,when the actuating ring 150 is rotated.

The second rotation sensing part 350 is provided to sense a change inposition of the second sensing object M2, and is disposed between thesecond sensing object M2 and the valve assembly 190, for example,between the second sensing object M2 and the first sensing object M1.

For example, the second rotation sensing part 350 may include a case360, a substrate 370, and a sensor.

The case 360 is installed to be fixed to the support frame 140, forexample, to a lower side of the frame main body part 141, and thesubstrate 370 connected to a controller of an appliance is installed atthe case 360.

In some examples, the substrate 370 is installed at the case 360, and isinstalled at sides facing the frame main body part 141 and the secondsensing object M2. The sensor configured to sense a change in positionof the second sensing object M2 is installed at the substrate 370.

The second rotation sensing part 350 having the above configurationsenses a position of the second sensing object M2 by a non-contactmethod, like the first rotation sensing part 300. For this, the secondsensing object M2 may include a magnetic member configured to generate amagnetic force, and the second rotation sensing part 350 may include aHall sensor 380 configured to sense a magnetic force of a magneticmember within a predetermined distance from the second rotation sensingpart 350. The Hall sensor 380 is installed at the substrate 370. When amagnetic member is within a predetermined distance from the Hall sensor380, the Hall sensor 380 may sense a magnetic force of the magneticmember and generate a signal corresponding to the sensed magnetic force.

According to the present implementation, the second rotation sensingpart 350 includes a plurality of Hall sensors 380, and the plurality ofHall sensors 380 are arranged to be spaced apart at predeterminedintervals along a rotation path of the second sensing object M2.

That is, when the second sensing object M2 is rotated by drawing acircular trajectory similar to the shape of the outer peripheral surfaceof the flange part 152 when the actuating ring 150 is rotated, theplurality of Hall sensors 380 are disposed to form an arc shapecorresponding to a rotation trajectory of the second sensing object M2in the second rotation sensing part 350.

In some examples, a pair of Hall sensors 380 are disposed in the secondrotation sensing part 350, and the Hall sensors 380 and the secondsensing object M2 are disposed such that the second sensing object M2 isdisposed between the pair of Hall sensors 380 when the knob ring 120 andthe actuating ring 150 are at initial positions.

According to this, when the knob ring 120 is rotated in one direction,the second sensing object M2 comes close to any one of the pair of Hallsensors 380 (hereinafter referred to as “left Hall sensor”) within apredetermined distance, and the corresponding Hall sensor 380 senses thesecond sensing object M2. When the knob ring 120 is rotated in the otherdirection, the second sensing object M2 comes close to the other one ofthe pair of Hall sensors 380 (hereinafter referred to as “right Hallsensor”) within a predetermined distance, the corresponding Hall sensor380 senses the second sensing object M2.

When the knob ring 120 is disposed to provide a timer function, when theknob ring 120 is rotated in one direction, the second sensing object M2comes close to the left Hall sensor 380 within a predetermined distance,and the left Hall sensor 380 senses the second sensing object M2.Accordingly, manipulation of the knob ring 120 for starting timeroperation may be sensed by the second rotation sensing part 350, and atimer may be operated (see FIG. 16).

When the knob ring 120 is rotated in the other direction, the secondsensing object M2 comes close to the right Hall sensor 380 within apredetermined distance, and the right Hall sensor 380 senses the secondsensing object M2. Accordingly, manipulation of the knob ring 120 forstarting timer operation may be sensed by the second rotation sensingpart 350, and a timer may be operated.

In some examples, different types of signals are generated by differentHall sensors 380. That is, a signal generated by the left Hall sensor380 and a signal generated by the right Hall sensor 380 are differentfrom each other.

Using this, a function of the knob ring 120 may be configured so thattime of a timer is differently set according to rotating directions ofthe knob ring 120, or a function of the knob ring 120 may be configuredso that different functions are provided according to rotatingdirections of the knob ring 120.

As an example, a function of the knob ring 120 may be configured so thattime of a timer is set in units of minutes when the knob ring 120 isrotated in one direction, and time of a timer is set in units of secondswhen the knob ring 120 is rotated in the other direction.

As another example, a function of the knob ring 120 may be configured sothat a timer is set when the knob ring 120 is rotated in one direction,and setting of the timer is disabled when the knob ring 120 is rotatedin the other direction.

As still another example, a function of the knob ring 120 may beconfigured so that a timer function is provided when the knob ring 120is rotated in one direction, and a function other than the timerfunction is provided when the knob ring 120 is rotated in the otherdirection.

The signals generated by the Hall sensors 380 may be provided asfundamental information for recognizing information output by thedisplay device 123 (see FIG. 2).

For example, using a signal generated by the left Hall sensor 380 asfundamental information, information such as whether timer operation isstarted and time of a timer may be recognized, and the informationrecognized as above may be output in the form of text, drawing, or coloron the display device 123.

[Actions and Effects of Structures for Sensing Rotations of Knob andKnob Ring]

Referring to FIGS. 11 and 12, rotation of the knob 110 may be sensed bya non-contact method using the first sensing object M1 and the firstrotation sensing part 300, and rotation of the knob ring 120 may besensed by a non-contact method using the second sensing object M2 andthe second rotation sensing part 350.

In this case, the centers of rotation of the first sensing object M1 andthe second sensing object M2 are arranged in a row along a single axis,for example, along the adjusting shaft 194. The first rotation sensingpart 300 provided to sense a position of the first sensing object M1 isalso disposed on the same axis, and the centers of rotation of the firstsensing object M1 and the second sensing object M2 and the firstrotation sensing part 300 are arranged in a row along the single axis.

To design a structure of a knob assembly in the form in which the aboveare arranged in a row along the adjusting shaft 194, transmission of arotary force for adjusting an opening amount of a valve and transmissionof a rotary force for changing a position of the first sensing object M1should be performed by the single adjusting shaft 194, and the firstrotation sensing part 300 should be able to pass the adjusting shaft 194therethrough and effectively sense a change in a position of the firstsensing object M1. In some examples, the second sensing object M2 isrotated, and the adjusting shaft 194 may pass through the actuating ring150.

According to the present implementation, from the knob 110, theadjusting shaft 194 may sequentially pass through the actuating ring150, the rotary plate 250 on which the first sensing object M1 isinstalled, and the first rotation sensing part 300 to be connected tothe valve assembly 190 to transmit a rotary force for adjusting anopening amount of a valve to the valve assembly 190. The adjusting shaft194, which is installed to connect between the knob 110 and the valveassembly 190 as above, is also rotated to transmit the rotary force foradjusting the opening amount of the valve such that the position of thefirst sensing object M1 is also changed.

That is, just by having the single adjusting shaft 194, all of shaftactions necessary for transmitting a rotary force for adjusting anopening amount of a valve and shaft actions necessary for sensing arotary position of the knob 110 may be provided.

Other designs for the structure may be possible because rotation of theknob 110 is sensed by a non-contact method with a combination of thefirst sensing object M1 and the first rotation sensing part 300.

In some cases, to transmit a rotary force for adjusting an openingamount of a valve, a physical connection between the adjusting shaft 194and the valve may be required. For example, when a rotation sensingdevice is configured such that physical connection with the adjustingshaft 194 is necessary to sense rotation of the knob 110, an additionalpower transmission structure may be provided to transmit a rotary forceof the adjusting shaft 194 to the rotation sensing device.

For example, when a rotation sensing device for sensing rotation of theknob 110 is configured in the form including an encoder, a separaterotating shaft for transmitting a rotary force of the adjusting shaft194 to the encoder and gears configured to connect between the rotatingshaft and the adjusting shaft 194 may be added.

In some cases, when the power transmission structure including aseparate rotating shaft and gears as above is added, the number ofcomponents and assembly processes may increase, a manufacturing cost mayincrease, and a level of difficulty of a manufacturing task may increasedue to addition of a complicated process for satisfaction on gearbacklash. In some cases, when the power transmission structure isrepeatedly used, an error in a sensed result may be increased due towear of gears, changes in engagement states of the gears, etc.

In comparison to the above, in the rotation sensing structure of theknob 110 of the present implementation, rotation of the knob 110 issensed by a non-contact method, and all of shaft actions necessary fortransmitting a rotary force for adjusting an opening amount of a valveand shaft actions necessary for sensing a rotary position of the knob110 may be provided. Thus, an additional power transmission structurefor transmitting a rotary force of the adjusting shaft 194 to a sensingdevice is not required.

Since rotation of the knob ring 120 is also sensed by a non-contactmethod in a structure for sensing rotation of the knob ring 120 of thepresent implementation, an additional power transmission structure fortransmitting rotation of the knob ring 120 to a sensing device is notrequired.

Therefore, according to the knob assembly and the appliance having thesame described in this application, a function in which a physical powertransmission operation through manipulation of the knob 110 and asensing operation for sensing manipulation of the knob 110 aresimultaneously performed can be provided, an increase in the number ofcomponents, assembly processes, and manufacturing costs necessary forimplementing such a function can be suppressed, a manufacturing task canbe more easily performed, and performance of sensing manipulations ofmanipulation switches such as the knob 110 and the knob ring 120 can beeffectively improved.

In some implementations, an independent manipulation switch whosefunction and shape are different from those of a conventional knob ringis provided using a knob ring installed to finish a knob. In someexamples, a user can easily select a manipulation switch suitable for acertain purpose such that convenience in use is improved, and the numberof manipulation switches disposed at a front surface of the appliance isdecreased such that an appearance of the front surface of the applianceis improved.

In some implementations, a function in which a physical powertransmission operation through manipulation of a knob and a sensingoperation for sensing manipulation of the knob are simultaneouslyperformed can be provided, an increase in the number of components,assembly processes, and manufacturing costs necessary for implementingsuch a function can be suppressed, a manufacturing task can be moreeasily performed, and performance of sensing manipulations ofmanipulation switches such as a knob and a knob ring can be effectivelyimproved.

Although the present disclosure has been described above with referenceto implementations illustrated in the drawings, this is merelyillustrative, and those of ordinary skill in the art to which thepresent disclosure pertains should understand that various modificationsand other equivalent implementations are possible from theabove-described implementations. Therefore, the actual technical scopeof the present disclosure should be defined by the claims below.

What is claimed is:
 1. A knob assembly for an appliance, the knobassembly comprising: a knob configured to be arranged at a front panelof the appliance and to rotate about an axis; a shaft configured torotate based on rotation of the knob and to cause operation of theappliance; a first rotation sensing part configured to sense rotation ofthe shaft; a rotary member that is configured to rotate according torotation of the shaft, and that comprises a first sensing target,wherein a position of the first sensing target changes based on rotationof the rotary member and the first rotation sensing part is furtherconfigured to sense at least one of the position or an amount of changeof the position of the first sensing target; a knob ring that isconfigured to be arranged at the front panel annularly around the knob,that is configured to rotate about the axis independently of rotation ofthe knob, and that comprises a display device configured to displayinformation; and a second rotation sensing part configured to senserotation of the knob ring, wherein the display device is configured tooutput a first result value indicating a rotation of the knob sensed bythe first rotation sensing part, output a second result value indicatinga rotation of the knob ring sensed by the second rotation sensing part,and alternate output of the first result value and output of the secondresult value.
 2. The knob assembly of claim 1, wherein the firstrotation sensing part is further configured to sense the position or theamount of change of the position of the first sensing target withoutcontacting the first sensing target, and wherein the first rotationsensing part and the first sensing target are configured to be arrangedbehind the front panel of the appliance.
 3. The knob assembly of claim2, wherein the first sensing target comprises a magnetic memberconfigured to generate magnetic force, and wherein the first rotationsensing part comprises a Hall sensor configured to sense magnetic forcewithin a first distance from the Hall sensor.
 4. The knob assembly ofclaim 3, wherein the first rotation sensing part comprises a pluralityof Hall sensors that are each configured to generate a signal based ondetection of magnetic force and that are arranged at intervals along arotation path of the first sensing target.
 5. The knob assembly of claim4, wherein the plurality of Hall sensors comprise a first Hall sensorlocated at a first position at the first rotation sensing part, and asecond Hall sensor located at a second position that is different fromthe first position, and wherein the first Hall sensor is configured togenerate a first type of signal, and the second Hall sensor isconfigured to generate a second type of signal that is different fromthe first type of signal.
 6. The knob assembly of claim 1, furthercomprising a second rotation sensing part configured to sense rotationof the knob ring.
 7. The knob assembly of claim 6, further comprising asecond rotary member that is configured to rotate based on rotation ofthe knob ring, and that comprises a second sensing target, wherein aposition of the second sensing target changes based on rotation of thesecond rotary member, and wherein the second rotation sensing part isconfigured to sense at least one of the position or an amount of changeof the position of the second sensing target.
 8. The knob assembly ofclaim 7, wherein the second rotation sensing part is configured to sensethe position or the amount of change of the position of the secondsensing target without contacting the second sensing target, and whereinthe second rotation sensing part and the second sensing target areconfigured to be arranged behind the front panel of the appliance. 9.The knob assembly of claim 8, wherein the second sensing targetcomprises a magnetic member configured to generate magnetic force, andwherein the second rotation sensing part comprises a Hall sensorconfigured to sense magnetic force generated by the magnetic member. 10.The knob assembly of claim 9, wherein the second rotation sensing partcomprises a plurality of Hall sensors that are each configured togenerate a signal based on detection of magnetic force, and that arearranged at intervals along a rotation path of the second sensingtarget.
 11. The knob assembly of claim 1, wherein the shaft comprises aknob shaft that is configured to extend from the knob through the knobring and behind the front panel of the appliance.
 12. The knob assemblyof claim 1, wherein the shaft comprises a valve shaft that is configuredto extend behind the front panel of the appliance and to controloperation of a valve assembly according to the rotation of the knob. 13.The knob assembly of claim 1, wherein the knob ring is configured to berotated by a predetermined angle from an initial position in clockwiseand counterclockwise directions, and wherein the knob ring isconfigured, based on the knob ring being rotated by a user from theinitial position, to return to the initial position upon release of theknob ring by the user.
 14. An appliance comprising: a front panel; and aknob assembly located at the front panel, the knob assembly comprising:a knob located at a front panel of the appliance and configured torotate about an axis, a shaft configured to rotate based on rotation ofthe knob and to cause operation of a device coupled to the appliance, afirst rotation sensing part configured to sense rotation of the shaft, arotary member that is configured to rotate according to rotation of theshaft, and that comprises a first sensing target, wherein a position ofthe first sensing target changes based on rotation of the rotary memberand the first rotation sensing part is further configured to sense atleast one of the position of the first sensing target or an amount ofchange of the position of the first sensing target, a knob ring that isconfigured to be arranged at the front panel annularly around the knob,that is configured to rotate about the axis independently of rotation ofthe knob, and that comprises a display device configured to displayinformation, and a second rotation sensing part configured to senserotation of the knob ring, wherein the display device is configured tooutput a first result value indicating a rotation of the knob sensed bythe first rotation sensing part, output a second result value indicatinga rotation of the knob ring sensed by the second rotation sensing part,and alternate output of the first result value and output of the secondresult value.
 15. The appliance of claim 14, wherein the first rotationsensing part is further configured to sense the position or the amountof change of the position of the first sensing target without contactingthe first sensing target, and wherein the first rotation sensing partand the first sensing target are located behind the front panel of theappliance.
 16. The appliance of claim 15, wherein the first sensingtarget comprises a magnetic member configured to generate magneticforce, and wherein the first rotation sensing part comprises a Hallsensor configured to sense magnetic force within a first distance fromthe Hall sensor.
 17. The appliance of claim 14, wherein the knobassembly further comprises: a second rotation sensing part configured tosense rotation of the knob ring; and a second rotary member configuredto rotate based on rotation of the knob ring, and that comprises asecond sensing target, wherein a position of the second sensing targetchanges based on rotation of the second rotary member, and wherein thesecond rotation sensing part is configured to sense at least one of theposition of the second sensing target or an amount of change of theposition of the second sensing target.
 18. The appliance of claim 17,wherein the second rotation sensing part is configured to sense theposition or the amount of change of the position of the second sensingtarget without contacting the second sensing target, and wherein thesecond rotation sensing part and the second sensing target are locatedbehind the front panel of the appliance.
 19. The appliance of claim 14,wherein the shaft of the knob assembly comprises a knob shaft thatextends from the knob through the knob ring and behind the front panelof the appliance.
 20. The appliance of claim 14, wherein the shaft ofthe knob assembly comprises a valve shaft that extends behind the frontpanel of the appliance and to control operation of a valve assemblyaccording to the rotation of the knob.
 21. The appliance of claim 14,wherein the knob ring is configured to be rotated by a predeterminedangle from an initial position in clockwise and counterclockwisedirections, and wherein the knob ring is configured, based on the knobring being rotated by a user from the initial position, to return to theinitial position upon release of the knob ring by the user.